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1 Polysaccharides are important biological molecules with diverse functions in
living organisms.
(a) The table shows some properties of starch and cellulose.
Property Starch Cellulose
Monomer α-glucose β-glucose
Branching Present in amylopectin; Absent
absent in amylose
Glycosidic bond type α-1,4 and α-1,6 β-1,4
Insoluble
Solubility in water Amylose: slightly soluble;
Amylopectin: insoluble
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(i) Explain how the difference in glycosidic bonds between starch and cellulose
results in different molecular structures.
(3)
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(ii) With reference to the information in table, explain why starch is a suitable
storage molecule in plant cells.
(3)
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for more papers: tyrionpapers.com
Turn over
for more papers: tyrionpapers.com
,DO NOT WRITE IN THIS AREA
1 Polysaccharides are important biological molecules with diverse functions in
living organisms.
(a) The table shows some properties of starch and cellulose.
Property Starch Cellulose
Monomer α-glucose β-glucose
Branching Present in amylopectin; Absent
absent in amylose
Glycosidic bond type α-1,4 and α-1,6 β-1,4
Insoluble
Solubility in water Amylose: slightly soluble;
Amylopectin: insoluble
DO NOT WRITE IN THIS AREA
for more papers: tyrionpapers.com
, DO NOT WRITE IN THIS AREA
(i) Explain how the difference in glycosidic bonds between starch and cellulose
results in different molecular structures.
(3)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
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……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
DO NOT WRITE IN THIS AREA
……………………………………………………………………………………………………………………………………
(ii) With reference to the information in table, explain why starch is a suitable
storage molecule in plant cells.
(3)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
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